In this paper, we present a comparative study in a MANET environment. MANET is specifically characterized by high mobility of network nodes and frequent changes of direct visibility. We study the characteristics and performance of routing protocols that support multiple transmissions in ad hoc wireless networks, under different network loads, number of nodes within the network and mobility parameters. We present a model that incorporates nodes with role of proxy. The model is evaluated through simulation experiments in order to confirm the feasibility of his application in real conditions. In our measurements we use one proxy node in order to broadcast the messages in the destination. We use the file transfer protocol to measure the performance of our model. The protocol provides file downloading from a dynamically discovered service component available in a MANET locality, even if the server moves during file transfer.

Rizos G.E.,ATEI of Epirus | Vasiliadis D.C.,ATEI of Epirus | Stergiou E.,ATEI of EpirusRecent Researches in Communications and IT - Proc. of the 15th WSEAS Int. Conf. on Communications, Part of the 15th WSEAS CSCC Multiconference, Proc. of the 5th Int. Conf. on CIT'11 | Year: 2011

In this paper, we present a model that incorporates nodes with role of proxy in a MANET environment. MANET is specifically characterized by high mobility of network nodes and frequent changes of direct visibility. In partially connected ad hoc networks, the destination is not always reachable. In our model we need a proxy node to relay messages to the destination. Proxies are nodes that have high probability of reaching the destination. In our scheme, when a source sends a request for a destination and the destination is not reachable, then some of the nodes in the network will choose to become the proxy for the destination. The model has been evaluated via simulation in order to confirm the feasibility of his application in real conditions. In our measurements we use one proxy node in order to broadcast the messages in the destination.